Molybdate

Electrochemistry

Metallurgy

Materials science

Powder metallurgy

Lubricant

Lubricity

Lubrication

Physical chemistry

Thermodynamics

Physics

Alloy

Microstructure

Composite material

Tribology

Chemistry

Tribocorrosion

Electrode

Atmospheric temperature range

Friction coefficient

Tribology International

Tribological behavior of nickel aluminum alloy containing silver constructed by powder metallurgy was investigated in a broad temperature range. It is noticed that Ni3Al alloy-20 wt% Ag exhibits favorable lubricating properties especially at and above 800 °C. The self-lubricating alloy possesses coefficient of friction (CoF) and wear rate (WR) low to 0.2 and 1–2 × 10−5 mm3/Nm, respectively. Moreover, a lubricating mechanism is proposed that at low temperatures, Ag provides effective lubrication; while at elevated temperatures; silver molybdate created by tribological chemical reactions contributes to low CoF. It is demonstrated that combination of Ag and Ag2MoO4 is a feasible way that plays a synergistic effect and generates excellent lubricity in a wide range of temperatures.

Tribological behavior of Ni3Al–Ag based self-lubricating alloy with Ag2MoO4 formed by high temperature tribo-chemical reaction